Every one needs one cocoa-based brownie and one made with melted chocolate. These days, it is difficult to find quality unsweetened chocolate but new-kid-on-the-block chocolatiers, Scharffen Berger makes unsweetened chocolate, as well as semi-sweet and others that are the dreams of pastry chefs like me. Here both types of chocolat get a work out in this second ‘little black dress” of brownie-dom.